package com.kh.reggie.controller;


import com.kh.reggie.common.Result;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;


/**
 * 文件上传下载
 */
@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {
    @Value("${takeOutFile.fileLocaltion}")
    private String basePath;

    @PostMapping("/upload")
    public Result<String> upload(MultipartFile file){
        String originalFilename = file.getOriginalFilename();
        log.info("正在上传文件(原始文件名):{}",originalFilename);
//        判断目录是否存在
        File dir = new File(basePath);
        if (!dir.exists()){
            dir.mkdir();
        }
        String fileName = UUID.randomUUID().toString()+"-"+originalFilename;
        try {
//            file.transferTo(new File(basePath+ UUID.randomUUID()+"%"+originalFilename));
//            String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
//            file.transferTo(new File(basePath+ UUID.randomUUID()+suffix));
            file.transferTo(new File(basePath+fileName));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        return Result.success(fileName);
    }

    /**
     * 文件下载
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        log.info("下载回显文件{}",basePath+ name);

        try {
            //        输入流，读取文件
            FileInputStream fileInputStream = new FileInputStream(basePath+ name);
            //        输出流，返回文件展示
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("image/jpeg");

            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len =fileInputStream.read(bytes))!=(-1)){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            outputStream.close();
            fileInputStream.close();

        } catch (Exception e) {
            throw new RuntimeException(e);
        }


    }

}
